PHP-如何在点扩展名前的括号内增加文件名ID？

Question

I have a file that will get modify from time to time and I need to track the file name each time there are new changes to the file. I expect to a sequence of file names eventually, for example: first-filename-1701.txt, 2nd-filename-1701(1).txt, 3rd-filename-1701(2).txt and etc.. From the results of my code below, it is producing the file names as: first-filename-1701.txt, 2nd-filename-1701(1).txt, 3rd-filename-1702(2).txt, 4th-filename-1703(3).txt and so forth. Can someone kindly points out what I am doing wrong? Regexp is not my every day thing. Thanks.

$name = 'new-foo-bar-1701(1).txt';

$re1='.*?';         # Non-greedy match on filler
$re2='\(([\d]+)\)'; # Round Braces 1

// set new filename
$_name = "";

// check if true
if($c=preg_match_all("/".$re1.$re2."/is", $name, $matches))
{
    $rbraces  = $matches[1][0] + 1;
    $_name .= preg_replace("/".$matches[1][0]."/", $rbraces, $name); 
}
else
{
    $_name .=$name; 
}

print $_name; // new-foo-bar-1702(2).txt

Answer 1

You do not need to find matches to replace them later, that leads to over-replacement. You should replace "on the fly" using a preg_replace_callback that will replace exactly what is being matched (or captured).

$name = 'new-foo-bar-1701(1).txt';

$re1='.*';          # Greedy match on filler
$re2='\((\d+)\)';   # Round Braces 1

// set new filename
$_name = "";

$_name .= preg_replace_callback("/(".$re1. ")".$re2."/", function($m){
    return $m[1] . "(" . ($m[2] + 1) . ")";
}, $name); 

print $_name;

See the IDEONE demo

Note that since you plan to replace the numbers at the end of the string, greedy dot matching "filler is preferred.

Answer 2

I don't think there is much to change in your code except this line to

$_name .= preg_replace("/\(".$matches[1][0]."\)/", "(".$rbraces.")", $name); 

Ideone Demo

Explanation

\\d+ is matched to 1 , but there is 1 already present twice in your string. So it is replaced to 2702(2) .

In order to match 1 specifically from () , you need to put that in your regex as denoted above.